Abstract: For easy operation under a high density mounting circumstance, a multiple type optical connector plug to be connected with an optical adapter formed via a partition wall provided in a plural branch structured module, is provided with canceling levers (11), each including locking pieces (12) for engaging with the adapter and locking pieces (11a) on a rear end portion, on one surface in a longitudinal direction of a plug main body (1) from a front side toward a rear side, and a slider (13) movably attached to regulation regions in an axial direction of the plug main bodies (1) via a holder portion which is divided into upper and lower portions (19a, 19b) for incorporating plug main bodies (1), and the slider (13) has cam portions (13a) which engage with the canceling pieces (11a) on each of the canceling levers (11) so as to be capable of pressing them.